静叶轮毂间隙对高压压气机气动性能的影响

Numerical investigation of the stator hub gap effects on aerodynamic performance of a high-pressure compressor

为了考察静叶轮毂间隙对压气机气动性能的影响以及揭示静叶轮毂间隙流动增强压气机稳定性的机理,以某型发动机高压压气机中两级为研究对象,运用三维粘性稳态数值模拟方法重点考察了静叶轮毂间隙附近的流动情况,从能量损失角度进一步分析了不同大小间隙导致压气机性能优劣的原因。研究结果证明,适当大小的间隙可以削弱静叶近轮毂处二次流和旋涡运动,改善当地流动状况,从而减少能量损失,提高压气机性能,特别是能增大喘振裕度。这些积极作用有利于压气机高效、稳定运行。

To investigate the influence of stator hub gap on the aerodynamic performance and stability of the high-pressure compressor,a two-stage axial-flow compressor which is a part of an aeroengine core-compressor was studied using a three-dimensional viscous flow analysis.Flow fields of the compressor were investigated at two operating points with and without the stator hub gap.For the computation without stator hub gap,the secondary flow and vortex movement near hub decreases the total pressure ratio,isentropic efficiency and compressor stability.While for the computation with stator hub gap,the leakage flow through the hub gap blows away the low energy fluid in the endwall region,and improves aerodynamic performance and compressor stability,especially for the near stall operating point.